Help with uploading files post CC discontinuation

Please can you allow me to bulk uopload all of my files back into the cloud. 

All of our folders and files were kept in a collaborative folder but because this folder was not "owned" by me I only have copies which I downloaded to an external hard drive.

Now the CC desktop sync has happend I need to access the files but I can not bulk upload them from the hard drive to my online cloud account.

I don't believe I saw anything telling us that files kept in a collaborative folder were at risk of not being retained.

Please help